EP0442070B1 - Sheet metal pump casing - Google Patents

Sheet metal pump casing Download PDF

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Publication number
EP0442070B1
EP0442070B1 EP90123674A EP90123674A EP0442070B1 EP 0442070 B1 EP0442070 B1 EP 0442070B1 EP 90123674 A EP90123674 A EP 90123674A EP 90123674 A EP90123674 A EP 90123674A EP 0442070 B1 EP0442070 B1 EP 0442070B1
Authority
EP
European Patent Office
Prior art keywords
reinforcement element
wall
transverse
end portion
suction port
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90123674A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0442070A1 (en
Inventor
Renzo Ghiotto
Silvano Pelizzaro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebara Corp
Original Assignee
Ebara Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebara Corp filed Critical Ebara Corp
Publication of EP0442070A1 publication Critical patent/EP0442070A1/en
Application granted granted Critical
Publication of EP0442070B1 publication Critical patent/EP0442070B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4273—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps suction eyes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4266—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps made of sheet metal

Definitions

  • the present invention relates to a sheet metal casing with differentiated thickness for centrifugal pumps, of the type comprising a substantially cup-shaped main body formed by a peripheral wall which is continuously joined to a transverse end wall, means for connecting the main body to a transverse sealing plate which is arranged opposite to the end wall so as to define a pressure chamber enclosing an impeller, a substantially tangential delivery port and a substantially axial suction port.
  • a further attempt to stiffen the suction inlet and the end wall of the pump body consists in providing some box-like annular structures with a more or less complicated shape which are welded or are integrally formed with the coupling flange so as to give rigidity to the entire assembly.
  • These structures are not sufficiently resistant and are also relatively bulky and prevent rusty bolts from being removed owing to the extremely small space available between the flange and the pump body, which is mainly occupied by the reinforcement structures.
  • DE-3517828 discloses a pump casing provided with a reinforcement element having a transverse end portion, arranged at the suction region.
  • the aim of the present invention is to eliminate the aforementioned disadvantages by providing a sheet metal casing for centrifugal pump which has high characteristics of resistance and reliability as well as considerable constructive simplicity and reduced dimensions.
  • a particular object of the present invention is to provide a sheet metal casing with differentiated structure which is capable of easily withstanding, without deformation, both the internal stresses generated by the pressurized fluid and the external ones transmitted through the suction inlet.
  • Not least object of the present invention is to provide a sheet metal casing with differentiated thickness for centrifugal pump which can be easily obtained starting from commonly commercially available elements and materials and which is furthermore advantageous from a merely economical point of view.
  • the thickness of the reinforcement element is greater than that of the main body and is such as to integrally withstand, without deformation, both the pressure forces which act inside the chamber in a substantially axial direction and the static and dynamic stresses which act on the suction inlet.
  • the sheet metal casing has, at the end wall and at the suction port, a thickness and therefore a resistance which are greater than those of monolithic structures of the prior art, but it preserves the external geometric characteristics thereof, allowing extremely easy and unrestricted assembly and maintenance.
  • the casing according to the invention is formed by a main body 2, made of stamped plate, having substantially the shape of a cup, i.e. defined by a substantially cylindrical peripheral side wall 3 and by a transverse end wall 4 which uniformly blends into the wall 3 along the region 5.
  • the casing further comprises a suction port 6 which extends axially from the end wall 4 of the pump body and a pressure port 7 which extends tangentially from the peripheral wall 3 of the body 2.
  • the peripheral wall 3 of the body 2 preferably has a spiral-shaped volute 8 the end portion of which is joined to the discharge outlet 7.
  • a seal-holder plate 9 is provided on the high-pressure side opposite to the suction port 6 and is connected to a flange 10 of the main body 2 by means of a counter-flange 11 and appropriate coupling means, such as bolts, not depicted in the drawings.
  • the seal-holder wall 9 centrally supports a sealing pack 12 which seals a pressure chamber 13 within which an impeller 14, driven by a motor shaft 15, can rotate.
  • a substantially funnel-shaped reinforcement element is arranged at least partially within the main body 2 and is thicker than said main body.
  • the reinforcement element generally indicated by the reference numeral 20, comprises a transverse end portion 21 having at least partially a frusto-conical shape, preferably with a slightly curved cross-section, and a longitudinal end portion 22 having a substantially cylindrical or slightly tapered shape. While the transverse portion 21 is located inside the main body 2, the longitudinal portion 22 protrudes from the main body 2 passing through an axial opening 23 of the end wall thereof which defines a folded edge.
  • the transverse wall 21 is at least partially superimposed and rigidly coupled to the inner surface of the end wall 4, proximate to the peripheral edge 24 of the element 20 to provide a liquid-tight seal.
  • a bead of high-resistance, and perfectly fused welding accomplished for example by means of a laser beam applied by transparency through the wall 4, is executed in peripheral portions 25.
  • the coupling between the transverse portion 21 of the reinforcement element 20 and the end wall 4 of the body 2 may optionally be ensured by traditional spot-welding 16, though these latter are not absolutely necessary.
  • the longitudinal portion 22 of the reinforcement element 20 may be nested simply into the folded edge 23 of the end wall 4 without any welded connections.
  • the folded edge 23 of the apertured end wall 4 might have a diameter which is even greater than the illustrated one, since the wall 4 extends until it completely covers the welding bead 25 to thereby ensure optimum coupling with the transverse wall 21 of the element 20.
  • the element 20 defines the transverse wall of the sheet metal casing and is so sized to withstand, without deformation, both the pressure forces exerted by the pumped fluid in an axial direction, and the static and dynamic loads transmitted through the suction port 6.
  • the latter loads are generated by the external piping, not illustrated in the drawings, which is connected to the suction port 6 through a stamped plate flange 27 which is welded at 28 to the end of the longitudinal portion 22 of the element 20.
  • the transverse portion 21 of the element 20 is connected to the longitudinal portion 22 by means of an intermediate portion 20 including an annular corrugation 31 which forms a sealing ring for the impeller 14.
  • the longitudinal portion 22 of the element 20 provides the inlet duct of the suction port 6 and needs no further elements to form the inner wall of the inlet.
  • the embodiment illustrated in figure 2 differs from that of figure 1 essentially insofar as the longitudinal portion 22 of the element 20 has a larger diameter than the suction port 6.
  • the inlet duct of the latter element is formed by a sleeve 40 having a partially frusto-conical shape and is inserted inside the longitudinal portion 22 coaxially thereto.
  • the outer end 41 of the sleeve 40 is welded to the flange 27, whereas the inner end has a more complex geometry, comprising a peripheral edge 42 shaped complementarily to the transverse wall 21 of the element 20 and connected thereto at 43 to provide a liquid-tight seal, also in this case, by laser welding.
  • the sleeve 40 has an annular corrugation 44 which forms a sealing ring 45 for the impeller 14.
  • the longitudinal end portion 22 of the stiffening element forms an annular flange 46 which is frontally welded at 47 to the central portion 48 of the flange 27.
  • hermetical sealing with respect to the pumped fluid is ensured at the welding bead 25 and at the welding bead 43, so that the pressure of the fluid to be pumped is integrally acting upon the transverse wall 21 of the reinforcement element 20 and partially on the strongly stiffened annular corrugation 44 of the sleeve 40.
  • the invention achieves the proposed aim and objects, and in particular the fact is stressed that it provides the maximum reliability and resistance of the casing while keeping unchanged the advantages of the prior art regarding easiness of installation and use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rotary Pumps (AREA)
  • Paper (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Reciprocating Pumps (AREA)
EP90123674A 1990-02-13 1990-12-10 Sheet metal pump casing Expired - Lifetime EP0442070B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT85524A IT1239829B (it) 1990-02-13 1990-02-13 Corpo pompa in lamiera a spessore differenziato
IT8552490 1990-02-13

Publications (2)

Publication Number Publication Date
EP0442070A1 EP0442070A1 (en) 1991-08-21
EP0442070B1 true EP0442070B1 (en) 1995-04-12

Family

ID=11327493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90123674A Expired - Lifetime EP0442070B1 (en) 1990-02-13 1990-12-10 Sheet metal pump casing

Country Status (6)

Country Link
EP (1) EP0442070B1 (da)
AT (1) ATE121167T1 (da)
DE (1) DE69018608T2 (da)
DK (1) DK0442070T3 (da)
ES (1) ES2070984T3 (da)
IT (1) IT1239829B (da)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2676450B2 (ja) * 1991-01-11 1997-11-17 株式会社荏原製作所 板金製ポンプケーシング
IT1248200B (it) * 1991-01-11 1995-01-05 Ebara Corp Cassa in lamiera metallica per pompa centrifuga
DE29513904U1 (de) * 1995-08-30 1997-01-09 Sihi GmbH & Co KG, 25524 Itzehoe Seitenkanalkreiselpumpe mit Stufenpaketen in Blechkonstruktion
DE19838798C2 (de) * 1998-08-26 2002-08-29 Ind Tech Res Inst Pumpengehäuse aus einem Metallblech und Verfahren zu seiner Herstellung
FR2958324B1 (fr) * 2010-03-30 2015-12-25 Snecma Carter de turbomachine rigidifie
JP6236810B2 (ja) * 2013-03-14 2017-11-29 日本電産株式会社 ポンプ
WO2017168642A1 (ja) 2016-03-30 2017-10-05 三菱重工業株式会社 インペラ、回転機械、ターボチャージャー

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059582A (en) * 1959-04-24 1962-10-23 Bell & Gossett Co Motor pump unit
DE3517828A1 (de) * 1985-05-17 1986-11-20 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Pumpengehaeuse
US4775295A (en) * 1985-05-17 1988-10-04 Klein, Schanzlin & Becker Aktiengesellschaft Centrifugal pump casing

Also Published As

Publication number Publication date
IT9085524A1 (it) 1991-08-13
EP0442070A1 (en) 1991-08-21
ATE121167T1 (de) 1995-04-15
ES2070984T3 (es) 1995-06-16
DE69018608D1 (de) 1995-05-18
DK0442070T3 (da) 1995-07-03
DE69018608T2 (de) 1995-10-12
IT9085524A0 (it) 1990-02-13
IT1239829B (it) 1993-11-15

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